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v in (-oo:+oo)
18*v^7-(((21*v^3)/3)*v^3) = 0
18*v^7-7*v^6 = 0
18*v^7-7*v^6 = 0
v^6*(18*v-7) = 0
18*v-7 = 0 // + 7
18*v = 7 // : 18
v = 7/18
v^6 = 0
1*v^6 = 0 // : 1
v^6 = 0
v = 0
v in { 7/18, 0 }
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